How do you grep text with spaces?

How do you grep text with spaces?

If you want to allow for ANY space character (tab, space, newline, etc), then if you have a “grep” that supports EXTENDED regular expressions (with the ‘-E’ option), you can use ‘[[:space:]]’ to represent any space character….By hiding it from the grep command:

1. grep ‘ ‘ filename.
2. grep \ filename.
3. grep ” ” filename.

How do I ignore space in Linux?

How do you remove blank spaces at the end of a line in Linux? Remove just spaces: $ sed ‘s/ *$//’ file | cat -vet – hello$ bye$ ha^I$ # tab is still here! Remove spaces and tabs: $ sed ‘s/[[:blank:]]*$//’ file | cat -vet – hello$ bye$ ha$ # tab was removed!

How do you grep multiple items?

How do I grep for multiple patterns?

1. Use single quotes in the pattern: grep ‘pattern*’ file1 file2.
2. Next use extended regular expressions: egrep ‘pattern1|pattern2’ *. py.
3. Finally, try on older Unix shells/oses: grep -e pattern1 -e pattern2 *. pl.
4. Another option to grep two strings: grep ‘word1\|word2’ input.

What does * do in grep?

In grep -r * , then, the shell expands * to all files and directories in the current directory (usually except those that begin with a . ), and grep then works recursively on them.

What is space character in Linux?

In the context of command line arguments, a space is considered a special character because it separates the arguments. When an escape character appears in front of a space, it removes its special meaning and makes it appear to the shell just like any normal character (a, b, c, etc).

How do you grep dash?

There are two ways to grep for a string such as -string starting with a dash or hyphen: 1) Place -string (or whatever patterns you wish) in a file such as patterns. txt and use the grep -f option as in “grep -f patterns. txt myfile. txt” command.

How do you grep an empty line?

To match empty lines, use the pattern ‘ ^$ ‘. To match blank lines, use the pattern ‘ ^[[:blank:]]*$ ‘. To match no lines at all, use the command ‘ grep -f /dev/null ‘.

How do I match a space in Linux?

[[:space:]] will match exactly one white space character. [[:space:]]* will match zero or more white space characters.

What does grep C do?

The pattern that is searched in the file is referred to as the regular expression (grep stands for global search for regular expression and print out). Options Description -c : This prints only a count of the lines that match a pattern -h : Display the matched lines, but do not display the filenames.